--- Kurt Wall <[EMAIL PROTECTED]> wrote:
> Net Llama offered this little gem:
> % I'm building 2.4.6 (yes, the final is out!) and ran across the
> option
> % under Networking Options for "Packet socket: mmapped IO". The
> % description sounds nice "If you say Y here, the Packet protocol
> driver
> % will use an IO mechanism that results in faster communication. If
> % unsure say NO".
> %
> % OK...so if this is such a great thing, why would i say NO? I
> honestly
> % don't even understand what it does. Would there be any benefit to
> % activating this for a ppp dialup connection? Any risks?
>
> mmapped packet socket IO only buys you great benefits if you use
> the packet socket stuff. But, to break it down somewhat, mmapped IO
> is I/O to a memory map, an in-core image of a disk file. Obviously,
> I/O to memory is vastly faster than I/O to disk, and an mmapped file
> doesn't update the disk version until explicitly flushed (bdflush,
> for example, doesn't update the on-disk file). Most modern "cat"
> implementations, for example, use mmaps (memory maps), rather than
> long sequences of disk reads followed by writes to stdout. You won't
> see the difference for small files, but compare the performance of
> catting, say, a 10MB file, to reading that same file in using vi.
>
> I'm still sorting out the packet socket stuff, I'm afraid.
You apparently understand far better than I. Thanks for the
explanation. I guess i'll make my kernels slightly smaller and stop
including support for this.
> % I still haven't figured out why Netscape & Mozilla get sluggish
> under
> % 2.4.x kenels, so i'm kinda grasping at straws for solutions.
>
> Netscape and Mozilla are still broken, and the new VM code in the
> kernel hasn't helped. I've no problems with Opera in this regard.
Hrmmm....opera, eh? I tried it briefly about 2 months ago. The
interface sux so badly, but perhaps its the solution.
=====
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lonni J. Friedman [EMAIL PROTECTED]
Linux FAQ & Step-by-step help: http://netllama.ipfox.com
.
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